Biosorption of uranium and thorium

Tsezos, M.; Volesky, B.

doi:10.1002/bit.260230309

Cited by 447 publications

(155 citation statements)

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“…Studies 31,32 have reported that increase in fungal biomass dose generally increases the metal uptake rate due to increase in the number of binding sites. Hence increase in the biosorbent surface area, followed by slower metal deposition indicate a secondary metal-binding mechanism 33 . Figure 10 shows optimal metal concentration of 150 mg/l for maximum removal of copper and zinc, i.e.…”

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confidence: 99%

<i>In vitro</i> Compatibility of Fungi for the Biosorption of Zinc(II) and Copper(II) from Electroplating Effluent

et al. 2017

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The present study describes the potential of mixed fungal isolates, i.e. Aspergillus niger, Penicillium chrysogenum and Rhizopus oryzae for the removal of zinc(II) and copper(II) from aquatic environments. Capacity of mixed fungal biomass to adsorb Zn(II) and Cu(II) were studied in batch sorption experiments as bioremediators. Optimal conditions from contact time, pH, initial metal ion concentration and temperature for remediation of Zn(II) and Cu(II) were studied. Typically, the uptake of Zn(II) and Cu(II) rises with increasing pH up to 4.0. Optimal metal concentration was 150 mg/l when the maximum removal of copper and zinc was 69.5% and 30.3% respectively, was observed at initial metal concentration. Maximum uptake for metals was achieved after 15 min. The maximum biosorption for copper and zinc by selected fungi was achieved at 7.0 g of biosorbent. IR spectrum of three fungal species showed the presence of C=O groups, amine and amide N-H functional stretch.Keywords: Biosorption, copper, electroplating effluent, fungal isolates, zinc.WASTEWATER during electroplating activities involves poisonous heavy metals like chromium, mercury, zinc, nickel, cadmium, phosphorus and copper which build up in the food chain and cause different pathological states 1,2 . In recent years, association of different microbes has been used for wastewater treatment as bioremediators, as it was considered to have greater capability over pure and single isolates. The axenic cultures were devised to be mineralized rapidly and completely by the metabolic activity of different microorganisms 3 . The interactions between different heavy metals and microorganisms might be due to antagonistic, additive effects or synergic. These interactions might be multifaceted and distinguished which depends on the type of heavy metal ion and microbial species consortium. The collective effect of different heavy metals may be toxicity or growth stimulation in the same microbial consortium assorted from the additive effect of the single metal ions 4 . Fungi have diverse mechanisms for bioremediation of heavy metals, including metal uptake by cell-wall components, accumulation inside the cell or extracellular chelation by phytochelatins and metal lothioneins 5 . Waste samples were collected from a polluted water source near Al-Madina electroplating industry, Alipur Chattha, Pakistan, in sterilized and cleaned 1 l glass bottles with stopper. All samples were treated with 372 mg/l EDTA as the chelating agent to reduce toxicity in samples burdened with heavy metals. During examination, the samples were fresh, and were occurred immediately after return to the laboratory.The fungi were isolated by filtration of the electroplating waste for collection of fungal propagules using 0.45 m pore size filter paper 6 . The fungal spore suspension was prepared in 50 ml of saline solution, and 100 l of spore suspension was inoculated in sterilized petri dish with modified culture medium consisting of aureomycin (0.35 mg/l), glucose (10 g/l), rose bengal (0.035 mg/l), Cu...

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<i>In vitro</i> Compatibility of Fungi for the Biosorption of Zinc(II) and Copper(II) from Electroplating Effluent

et al. 2017

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“…The tests are usually performed at approximately 25-30ºC. However, Tsezos and Volesky, (1987); Kuyucak and Volesky (1989) and Aksu and Kutsal *Corresponding author (1991) reported a slight increase in cation uptake by seaweed in the range of 4 to 55ºC.…”

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Effects of temperature on the sorption of Pb2+ and Cd2+ from aqueous solution by Caladium bicolor (Wild Cocoyam) biomass

Horsfall¹,

Spiff²

2005

Electron. J. Biotechnol.

348

147

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This report is based on the investigation of the effect of temperature on the removal of Pb 2+ and Cd 2+ in aqueous effluent using C. bicolor biomass in a batch sorption process. The result showed that the most suitable sorption temperature was 40ºC with maximum sorption capacities of 49.02 mg/g and 52.63 mg/g for Pb 2+ and Cd 2+ respectively. Various thermodynamic parameters, such as ∆G o , ∆H o , ∆S o and E a have been calculated. The data showed that the sorption process is spontaneous and exothermic in nature and that lower solution temperatures favours metal ion removal by the biomass. The findings of this investigation suggest that physical sorption plays a role in controlling the sorption rate. The sticking probability model was further employed to assess the applicability of the C. bicolor biomass as an alternative adsorbent for metal ion contaminants in aqueous system.

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“…Each of the mixture was placed on a magnetic stirrer and agitated for a period of 1 hour to extract soluble organic compounds. The solid was filtered off and the dissolved organic carbon content determined [75][76][77][78][79][80][81][82].…”

Section: Determination Of Secondary Pollution In the Treated Watermentioning

confidence: 99%

Remediation of Some Selected Heavy Metals from Water Using Modified and Unmodified Mushrooms

Bii¹,

Mwangi²,

Wanjau³

et al. 2016

J Pollut Eff Cont

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The dispersal of toxic heavy metals by water from natural and anthropogenic is a worldwide environmental concern due to pollution. Despite some metals playing an important role in body, they are toxic when the level exceeds the tolerance limits while others such as lead have no known physiological value to human beings. Since heavy metals cannot be degraded, then their removal from drinking water is necessary. Mushrooms are readily available in Bomet County and their metal removal ability was investigated. The study aimed at removing heavy metals from water by adsorption using mushroom, as a cost-effective and sustainable method. The raw mushroom was modified with sodium hydroxide and characterization of both the parent material and its modified form was done using Fourier Transform Infrared spectrometry (FTIR). Sorption experiments were carried out using the batch adsorption method and sorption parameters including pH, contact time, adsorbent dose and initial metal ion concentration investigated. The results found out that the sorption capacity for cadmium ions ranged from 1.826-25.285 mg/g by the unmodified edible mushroom (UEM), the modified edible mushroom (EM), unmodified toxic mushroom (UTM) and modified toxic mushroom (TM). For copper ions, sorption capacity ranged from 0.002-4.097 mg/g, while that of the lead ions ranged from 1.345-2.593 mg/g by the UEM, EM, UTM and TM respectively. The sorption capacity showed improvement on modification as sorption of cadmium increased from 1.826-25.285 mg/g by the UEM, EM, UTM and TM. At a pH range of 4-6, the sorbent material was found to remove up to 90% of the metals. The sorbent material had a removal efficiency of 95% of the metals in less than 20 minutes. The UEM and UTM fitted well in Langmuir adsorption isotherm model for cadmium and lead ions. For copper ions, UEM, EM, UTM and TM fitted in the Freundlich model. TM for lead ions best fitted in the Freundlich model. The bio-sorption kinetics was determined by fitting first-order-Lagergreg and Pseudo-second-order kinetics models to the experimental data. It was found that the data for lead was better described by the pseudo-second-order model. For copper ion, the data was best described by Ho's pseudo second order for UEM and UTM, cadmium ions for all sorbents was best described by Lagergreg's first-order kinetics. The FTIR analysis suggested the possibility of the participation of carboxyl groups in metal uptake. The levels of dissolved organic carbon (DOC) were found to be 19.0 mg/L in the raw material and 2.19 mg/L after modification. It was confirmed that modification minimized secondary pollution. This indicated that mushrooms have a potential application for the remediation of metal polluted waters.

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Biosorption of uranium and thorium

Cited by 447 publications

References 4 publications

<i>In vitro</i> Compatibility of Fungi for the Biosorption of Zinc(II) and Copper(II) from Electroplating Effluent

<i>In vitro</i> Compatibility of Fungi for the Biosorption of Zinc(II) and Copper(II) from Electroplating Effluent

Effects of temperature on the sorption of Pb2+ and Cd2+ from aqueous solution by Caladium bicolor (Wild Cocoyam) biomass

Remediation of Some Selected Heavy Metals from Water Using Modified and Unmodified Mushrooms

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